John 6:20

Be not afraid (mh pobeisqe). Prohibition with mh and present middle imperative of pobeomai. So in Mark 6:50 ( Matthew 14:27 ). John does not tell that the disciples thought Jesus was an apparition ( Mark 6:49 ; Matthew 14:26 ), nor does he give the account of Peter walking on the water ( Matthew 14:28-31 ).